路由

netrain_flutter_app/lib/douwen/dwMain.dart

@@ -54,9 +54,10 @@ class _RouterNavigatorState extends State<RouterNavigator> {
     return Container(
       child: Column(
         children: [
-          _item("跳转", () {
-            Navigator.push(
-                context, MaterialPageRoute(builder: (context) => Second()));
+          _item("跳转", () async {
+            var result = await Navigator.push(
+                context, MaterialPageRoute(builder: (context) => Second(text:"")));
+            print("返回值：$result");
           })
         ],
       ),

netrain_flutter_app/lib/douwen/second1.dart

 import 'package:flutter/material.dart';
 import 'package:fluttertoast/fluttertoast.dart';
+import 'package:http/http.dart';
 
+class Second extends StatelessWidget {
+  Second({
+    Key key,
+    @required this.text
+  }):super(key: key);
+
+  final String text;
 
-class Second extends StatelessWidget{
   @override
   Widget build(BuildContext context) {
     return WillPopScope(
@@ -14,20 +21,18 @@ class Second extends StatelessWidget{
           ),
           home: Scaffold(
             appBar: AppBar(
-              title: Text("·2"),
+              title: Text("哦吼2"),
             ),
             body: RouterNavigator(title: 'Flutter Demo Home Page'),
           ),
         ),
         onWillPop: () async {
-          Fluttertoast.showToast(msg: "˳");
+          Fluttertoast.showToast(msg: "哦吼2");
           return true;
         });
   }
-
 }
 
-
 class RouterNavigator extends StatefulWidget {
   RouterNavigator({Key key, this.title}) : super(key: key);
   final String title;
@@ -44,9 +49,8 @@ class _RouterNavigatorState extends State<RouterNavigator> {
     return Container(
       child: Column(
         children: [
-          _item("ת", () {
-            Navigator.push(
-                context, MaterialPageRoute(builder: (context) => Second()));
+          _item("跳转", () {
+            Navigator.popUntil(context, ModalRoute.withName("/key1"));
           })
         ],
       ),